Reflecting electrical lamp.



E. H. TATE. REFLEGTING ELECTRICAL LAMP.

APPLIOATION FILED APR.30, 1910.

1,046,677, Patented Dec. 10, 1912.

I) i ii TE EARL H. TATE, 0]? LOS 'ANGELES, CALIFORNIA.

REFLECTING ELECTRICAL LAMP.

Specification of Letters Patent.

Patented Dec. 10, 1912.

Application filed April 30, 1910. Serial No. 558,723.

To all whom it may concern.-

Be it'known that I, EARL H. TATE, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Reflecting Electrical Lamp, of which the following is a specification.

An object of this invention is to increase the amount of light delivered by incandescent electric l amps; to increase the life of the filaments of such lamps and to make novel provision for directing the light where the same is required.

In carrying out this invention I so combine external and internal reflectors as to form in effect a substantially continuous perse the rays uniformly over the lighted area and for this purpose the reflecting surfaces of the external and internal reflectors are made of substantially the same general contour with one another.

The invention relates to the internal and external construction of the lamp and may be variously embodied.

The accompanying drawings illustrate the invention.

Figure l is a view partly in section of a high power reflecting electric lamp constructed in accordance with this invention. Fig. 2 is a view of a lamp of a differentform embodying features of this invention. Fig. 3 is a side view of a lamp similar to that shown in Fig. 2 with the exception that the outer reflector is omitted. Fig. 4 is a perspective view of an internal reflector of the character shown in Figs. 1, 2 and 3. Fig. 5 is a side view of a lamp of ordinary construction provided with a reflector attachment in accordance with this invention. Fig. 6 is a perspective view of the attachment shown in Fig. 5. Fig. 7 shows the outer reflector made in connection with an ordinary electric lamp.

In Figs. 2, 3, 5 and 7 the lamp is shown provided wit-h an incandescent lamp bulb 1 corresponding to those commonly used and made of glass and containing a filament 2 of some suitable construction. In Fig. 1 the bulb 1 is of an oblate form, and the filament coil 2 is laterally elongate. The base may be of any suitable form. The screw-threaded shank form is shown in the views to fit the well known Edison socket. In'Figs. 2 and 7 said base or shank 3 is provided with a skirt 4 having an internal reflecting surface 5 that may be produced in any well known manner as by silvering.

The skirt may be of various forms and in Figs. 2 and 7 it is shown made of the same material as the base 3 and integral therewith. A diflerent form of the integral skirt is shown at 4 in Fig. 1 as an extension of the base or shank 3.

In Figs. 5 and 6 the skirt 4 is shown construct-ed independent of the base so that it may be attached to any lamp having a standard base for which it is fitted.

Between the lamp base and the loop of the filament in Figs. 1, 2 and 3, a concave reflector is mounted inside the bulb. In Figs. 2, 3 and 4 said internal reflector is designated bythe character 7 and in Fig. 1 it is designated by the character 7.

The internal reflectors may be secured in place by various means and in the drawing they are shown as being supported by the insulating tube neck 8 which supports the filament.

In the forms shown in Figs. 2 and 3 the filament is braced by stays 9 and in Fig. 1 by stays 9. Said stays are of platinum wire or its equivalent and are connected. at one end with the looped filament and at the other end with the sealing tip 10 of the bulb. These stays are intended to prevent the vibration of the filament and to consequently avoid the liability of breakage from such vibration.

The detachable reflecting skirt 4 is provided at its contracted end wit-h a threaded seat 12 to screw onto the base 3 of an incandescent lamp and it isunderstood that in any instance it will be conformed to the base of the lamp to be fitted, so that when it is applied to such lamp the lamp may be inserted home in the socket of the lamp fixture therefor, not shown with the threaded seat 12 outside of the socket.

In practical use the rays of light ordinarily absorbed by the material of the base will be reflected, thus increasing the illuminating power of the lamp. By applying the reflector directly to the lamp proper either internally or externally or bot-h, said lamp is especially fitted for directing the rays of light where required, and in case the lamp is used on a cord this is of signal advantage in many instances.

The method of constructing the lamp will be understood by those versed in the art.

The insulation 8 will be sealed inside the base by suitable cement 14.

, process of manufacturing the internal reflector and may be connected with copper wires 17 18, inside the tube neck 8 and by said copper wires with the contacts formed by the base 3 and the plate 19. By thus mounting the reflector filaments the liability of any air leakage along the filaments is avoided.

The internal reflector is located above the front or lower edge of the external reflector for the reason that it is desirable to minimize the amount of reflecting surface subject to the high heat inside the bulb and thus in constructing the lamp with two reflectors there is less liability of breakage; and furthermore by arranging the internal reflector at the rear tapered portion of the bulb it is possible by making the external reflector detachable, that the lamp may at one time be made to throw some dispersed rays, the external reflector being removed for this purpose as clearly shown in Fig. 3 and at another time the rays maybe more concentrated by again applying the external reflector as in Fig. 5. The skirt 4 or 4 is provided with a collar 20 embracing the rear tapered portion 21 of the globe 1 or 1 of said lamp, as the case may be, said collar being formed with a tapered shoulder extending inwardly, the shank 3 or 3 being made integral with said shoulder 22 which thus forms a reducer shank adapted to permit its insertion into the lamp socket. The shank 3 or 3 terminates above in an inwardly bent flange 23, the edge of which practically fits and is flush with the upper end of the insulating tube neck 8 against which flange and neck the insulating cap 24 rests so as to form a tight and neat connection.

As shown in Figs. 1 and 2 the external and internal reflector surfaces are made of substantially the same general contour; the external reflector in Fig. 1 being cone or saucer-shaped and the internal reflector slightly concave; and in Fig. 2 the external and internal reflectors together form a bellshaped reflector. Thus in both instances the reflectors to all intents and purposes act as a single reflector, the division into external and internal reflectors being made to eliminate the effect of the non-illuminating portion of the lamp above the filament.

I regard as broadly new a lamp having external and internal reflector surfaces formed to substantially the same general contour so as to obtain maximum illuminating effect.

I claimi 1. In an electrical lamp, the combination with the bulb, of external and internal reector surfaces formed to the same general.

contour with one another substantially as and for the purpose set forth.

2. In an electrical lamp, the combination with the bulb, of a concave reflector surface inside of the bulb, and a reflector surface outside of the bulb and conforming to the general contour of the inside reflector surface substantially as and for the purpose set forth.

3. In an electrical lamp, a shank having an inwardly bent flange the edge of which practically fits and is flush with the upper end of the insulating tube neck of the lamp, and an insulating cap resting against the flange and neck substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand at Los Angeles, California,-this 25th day of April, 1910.

EARL H. TATE. In presence of.-

JAims R. TOWNSEND, L. BELLE RICE. 

